Heat radiator for furnaces



Patented Sept. 14., 1937 UNITED STATES HEAT nAmA'roa Foa FURNAcEs Theodore W. Munford, Toledo, Ohio, 'assignor to Surface Combustion Corporation, Toledo, Ohio, a corporation of New York Application March l,

`3 Claims.

This invention relates to improvements in heatradiating means for furnaces commonly employed for heating a pack of sheet steel supported cn a base forming part of the furnace structure. In

5 furnaces of this type, it is desirable to concentrate the heating, during the heating up period of the steel, near the base of the furnace to compensate for the fact that the pack is supported on the ,furnace base, and thereafter to distribute the heat l0 more uniformly between the top and bottom of the pack. With that desirability in mind, it is the object of theinvention to provide a fuelfired radiator which shall be capable of operation to accomplish that result and which shall be particularly well adapted for use in furnaces of the type mentioned. In some respects, the invention may be considered as an improvement'on the ring system disclosed in patent to Hepburn 2,041,341 dated May 19, 1936.

Referring to the accompanying drawing wherein the preferred form of the invention is shown,

Fig. l is a vertical longitudinal section of a heating furnace embodying the present invention, the view being taken on line I-I of Fig. 2, and

Fig. 2 is a vertical cross-section on line 2-2 of Fig. 1.

In. the drawing, 5 indicates the base of the furnace and 6 a hood which is removably seated thereon to form a heating chamber. The pack of sheets to be heat-treated is indicated at W, in

,dotted lines, and is supported on a raised platform 1 forming'part of furnacebase.

The improved heat radiator is generally indicated at 8, the same being disposed along the 3.5 side wall of the hood 'and comprising at least three tubular legs 9, III, and II which extend in a common direction from-a header I2, the legs being l shown as entering the hood through one and the 40 same end wall thereof. Ordinarily there will be two radiators along each of two opposite walls of the hood, the arrangement in this respect being similar to that ,disclosed in the said Hepburn patent.

The lower leg 9 of the 'radiator will ordinarily be of greater cross-sectional area than either of the other two legs. Fluid fuel Yis delivered to the outer end of the lower leg 9 by' a burner I3 which, for the purposes of this description, may be considered as identical with, or of the same vtype as, the burner disclosed in the said Hepburn patent. Coupled to the outer end of the other two legs I0 and I I are identical suction-producing devices Il and I5. These devices are preferably jet-operated exhausters of the same type as that disclosed in Fig. 8 of the said patent to Hepburn. The pipes for supplying operating fluid to the exhausters are indicated at I6, each pipe having a shutofl valve I1. At the outer end of each ex- I n musteris @manually adjustable damper la.

1937, Serial No. 128,372

The primary function of the exhausters is to pull combustion supporting air intothe lower combustion leg 9. However, whether both or only one of the exhausters shall be turned on will depend on heat requirements. Thus when the pack is cold, the upper exhauster I5 may be turned off but with its'damper I8 open to permit secondary air to flow into the tube II under the influence of the draftlor suction produced in the header I2 by the other exhauster I4. The air thus reaching the header will, of course, accelerate combustion of the residual fuel in the gases coming ,from the primary combustion leg 9 and thus caus'e'the leg I0 to become hotter near the header I2 than -it ordinarily would. The heat of the fuel will, therefore, be concentrated near the bottom lof the pack as is desirable when the pack is cold. Later on in the heating period, the exhauster `I5 will also be turned onwhereby to draw heating gases into the tube II with resultant more uniform application of heat to the pack. It may sometimes be desirable to shut off the lower exhauster I4 while leaving the upper exhauster I5 turned on with the end in View of pulling all of the heating gases through the upper leg. In such event the damper I8 associated with'the lower exhauster may be closed or left open as heating requirements demand.

Since both exhausters are individually regulable and are each provided with a damper and the amount of fuel supplied by the burner I3 is also subject to regulation, it will be readily appreciatedthat the production of heat and its distribution.. may be controlled to a nicety.

What I claim is:

1. The combination with the heating' chamber having a base on which the material to be heated is supported, of means for producing the heat in the chamber comprising a fuel red radiator therein, said radiator having atleast three horizontally extending heat radiating tubes disposed one above the other in spaced relation and a header connecting the tubes at one end, the

other end of the tubes extending out of the chamber, a burner for supplying fuel to theouter end of the lowermost of said tubes, and individually THEODORE W. 

